Rename patterns module to presets

Rename the driver module and update imports so tests and main entry use the new presets naming, while moving Preset to its own file.

Co-authored-by: Cursor <cursoragent@cursor.com>

test/patterns/off.py

@@ -2,7 +2,7 @@
 import utime
 from machine import WDT
 from settings import Settings
-from patterns import Patterns
+from presets import Presets
 
 
 def main():
@@ -10,11 +10,11 @@ def main():
     pin = s.get("led_pin", 10)
     num = s.get("num_leds", 30)
 
-    p = Patterns(pin=pin, num_leds=num)
+    p = Presets(pin=pin, num_leds=num)
     wdt = WDT(timeout=10000)
     
-    # Create an "off" preset
-    p.edit("test_off", {"pattern": "off"})
+    # Create an "off" preset (use short-key field `p` for pattern)
+    p.edit("test_off", {"p": "off"})
     p.select("test_off")
 
     start = utime.ticks_ms()